Saturday’s state Democratic convention in Nevada turned ugly when tensions over delegate selection prompted supporters of presidential hopeful Bernie Sanders to yell, swear and show their displeasure through graffiti.

Former presidents George W. Bush and George H.W. Bush say they won’t attend the Republican convention. John McCain is also a no-go. Former presidential candidate Mitt Romney has actively criticized the party’s presumptive nominee. In fact, aside from Bob Dole, Trump has struggled to attract much support from Republicans who have run for national office — until now.